Robert F. Kennedy Jr. is convinced that a lone gunman wasn't solely responsible for the assassination of his uncle, President John F. Kennedy, and said his father believed the Warren Commission report was a "shoddy piece of craftsmanship."

Kennedy and his sister, Rory, spoke about their family Friday night while being interviewed in front of an audience by Charlie Rose at the Winspear Opera House in Dallas. The event comes as a year of observances begins for the 50th anniversary of the president's death.

[...]He said his father thought the Warren Commission, which concluded Lee Harvey Oswald acted alone in killing the president, was a "shoddy piece of craftsmanship." He said that he, too, questioned the report.

"The evidence at this point I think is very, very convincing that it was not a lone gunman," he said, but he didn't say what he believed may have happened.